Magic photo?

I've had these weird little cards for awhile now and just found out they're called Topps(?) Magic Photo from 1949. They are a little larger than a postage stamp and apparently you had to spit on them or put water on them to develop them right before your eyes.(Black and white like the old polaroid cameras) Anyway I have a Babe Ruth, two Hans Wagner and a Ty Cobb among others, There's also nonsports "stuff" like The Empire State Building, Leaning Tower of Pisa, Abe Lincoln Memorial and some ?wrestling holds! Any body know more about these or where I could get info on their Value? Thanks, max
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A Ty Cobb recently sold for $129, a Wagner for $56.
Bowman Baseball -1948-1955
Fleer Baseball-1923, 1959-2007
Al